The writers have studied the relationship between the antifungal activity of extracts made from the leaves of Ericaceae plants and morphological classification of the plants. Twelves of thirty-one Ericaceae plants had antifungal activity on the conidia of Cochliobolus miyabeanus(S. ITO et KURIBAYASHI)DRECHSLER as shown in Table 1. A claer relationship, however, could not found in this experiment.